These are my favorite earbud tips. Sony really annoyed me with the way they sold these here. They would package several sizes together but only one of each size forcing you to pay quite a bit for the one size you needed. To add injury to insult, Sony stopped selling them here altogether. Fortunately, they can still be purchased from Japan and you get 2 sets of your preferred size without the waste of paying for sizes you have no use for. These are slightly more difficult to put on but they stay on much better. They form a better seal and last much longer than typical tips.Very comfortable too.